ANSI O – The Inside Story – The Inside Story Nelson Bingel Chairman – Fiber Stress Subcommittee 8 th International Conference on Utility Line Structures March 29-31, 2004 Fort Collins, Colorado

Re-issue Every 5 Years

Re-issue Every 5 Years Annex C

Re-issue Every 5 Years

Size Effect Calibrate Change: Pole Dimensions Change: Pole Dimensions or or Class Loads Class Loads Losing a Competitive Advantage Losing a Competitive Advantage Perceived as under engineered Perceived as under engineered

smaller LARGER

Implications of Changing Pole Circumferences Hardware and Standards Problems Hardware and Standards Problems How Differentiate Poles in the Field How Differentiate Poles in the Field Some Customers Might Switch, Some Customers Might Switch, Some will not Some will not Dual Inventory for Manufacturers Dual Inventory for Manufacturers Higher Costs for Wood Poles Higher Costs for Wood Poles Reduction in Reliability for Distribution Reduction in Reliability for Distribution

Size Effect Calibrate Change: Pole Dimensions Change: Pole Dimensions or or Class Loads Class Loads Geometry Effect Review FPL-39 Derivation Combine Test Data Derive New Fiber Stress

FPL-39 Test Data

LcLcLcLc Bending Load = L c x D (ft-lb) D 2 ft Class 1 4,500 lb Class 2 3,700 lb Class 3 3,000 lb Class 4 2,400 lb Class 5 1,900 lb ANSI O5.1 Class Loads Compression (psi) Tension (psi)

FPL-39 Assumptions Moisture 1.16 Strength Variation.93 Conditioning Air 1.00 Boultonizing.90 Steam.85 AMORGL Load Sharing

FPL-39 Final Results Near 5% Lower Exclusion Limit Average Bending Strength Three Pole Groups

FPL-39 Assumptions Moisture 1.16 Strength Variation.93 Conditioning Air 1.00 Boultonizing.90 Steam.85 AMORGL Load Sharing1.10Taller Small Clear Test Data

Combine ASTM and EPRI Test Data ANSI Database All Full Scale Tests Green, Untreated Poles

MORBP = MORGL AMORGL Fiber Stress at BP projected to Fiber Stress at G\L Broke at G/L Broke at G/L Broke Above G/L Broke Above G/L

D D LL MORBP (Fiber Stress) Observed Fiber GL Projected Fiber GL

Annex A Equation H = Height Above G/L L = Total Length Above G/L L = Total Length Above G/L H MAX = L / 2 H MAX = L / 2 F H = F G/L ( * H/L)

Annex A Equation F H = F G/L ( * H/L) F 35 = 8000psi ( * 35/70) 80 ft Douglas fir; 35 ft above G/L F 35 = 6000psi

Annex A Equation F H = F G/L ( * H/L) 6720 psi = F G/L ( * 20 / 70) MORBP = ft MORBP = ft F G/L = 7841 psi

Class Oversize Adjustment 1.07 to 1.158

Conditioning Adjustment Southern Pine.85 Southern Pine.85 (steam conditioning) (steam conditioning) Douglas-fir.90 Douglas-fir.90 (Boultonizing) (Boultonizing) Western Red Cedar 1.00 Western Red Cedar 1.00 (air seasoning) (air seasoning)

Drying Factor for Taller Poles Poles 50 feet and Taller Poles 50 feet and Taller Increase Test Data by 10% FPL-39Increase All Poles 16%

Summary of Derivation ClassOversize AMORGL Drying TestDataMORBP Conditioning

Results: No Change in Fiber Stress Values Is Warranted

Results: Distribution – No Change Transmission – Maybe Higher Class

2002 ANSI O5.1 Standard Approved Because Generally Conservative Some Members Still Unclear

2002 ANSI O5.1 Design Methodology To Use in the Office Correlates With the Test Data

2002 ANSI O5.1 Provides a Design Methodology To Use in the Office That Correlates With the Test Data

2002 ANSI O5.1 Provides a Design Methodology To Use in the Office That Correlates With the Test Data

ANSI O – The Inside Story Nelson Bingel Chairman – Fiber Stress Subcommittee 8 th International Conference on Utility Line Structures March 29-31, 2004 Fort Collins, Colorado